Thanks for your query.
Just by taking one pill 4 hours late, you would not increase your risk of getting pregnant.
However, while switching over to a new method of contraception
, and particularly within the first month of oral contraceptive
pill use, chances of failure are comparatively high.
Please remember that even this " high " translates into almost 97 % chances of being safe from pregnancy
To be doubly sure, double method like condom plus pills is recommended in the first one or two months of pill usage.
Wait for your period, and test for pregnancy at the earliest indication of a missed period.